Bitcoin's upward trajectory may continue due to several factors, including inter-market dynamics, positive sentiment stemming from BlackRock's ETF filing, and the demand for safe haven investments. While directional traders have experienced setbacks in recent months, with Bitcoin's price pulling back by over 16% from its peak of $31,000, the cryptocurrency still boasts a remarkable year-to-date gain of nearly 60%, outperforming Wall Street's tech-heavy index, Nasdaq, which rose by 38%.

One significant factor supporting Bitcoin's potential ascent is the weakening of the US dollar and reduced volatility in the bond market. The dollar index has registered three consecutive weekly losses, declining by 1.2% to 102.30. A weaker dollar tends to benefit Bitcoin, as the two have historically exhibited an inverse relationship. With the Federal Reserve pausing rate hikes and inflation cooling down, the dollar's strength appears to be waning, potentially favoring Bitcoin's upward trajectory.

Furthermore, the volatility in the US Treasury bond market is diminishing, often leading to increased risk-taking in financial markets. This shift in risk sentiment may further support Bitcoin's upward movement.

BlackRock's recent filing for a spot-based Bitcoin ETF also injects optimism into the market. As the world's largest asset manager, BlackRock's move indicates ongoing institutional interest in Bitcoin-based products. The proposed ETF, backed by CF Benchmarks' Bitcoin reference rate and including a surveillance-sharing agreement, may address regulatory concerns regarding price manipulation. This development not only showcases institutional demand for Bitcoin exposure but also adds pressure on the US Securities and Exchange Commission (SEC) to clarify its stance on cryptocurrencies.

Lastly, the demand for safe haven assets could contribute to Bitcoin's rise. While regulatory challenges surrounding altcoins have raised concerns, Bitcoin and Ethereum (ETH) have not been directly targeted in recent SEC lawsuits against major crypto exchanges. This limited impact on Bitcoin and Ethereum holders, combined with Bitcoin's dominance rate breaking out of a three-year oscillation pattern, indicates a potential rotation of investments from altcoins to Bitcoin.

In summary, Bitcoin's path of least resistance appears to favor further upward movement. Inter-market factors, optimism from BlackRock's ETF filing, and safe haven flows contribute to this positive outlook for the leading cryptocurrency.